Auto merge of #98914 - fee1-dead-contrib:min-deref-patterns, r=compiler-errors

Minimal implementation of implicit deref patterns for Strings

cc `@compiler-errors` `@BoxyUwU` https://github.com/rust-lang/lang-team/issues/88 #87121

~~I forgot to add a feature gate, will do so in a minute~~ Done

clippy_lints/src/format.rs

@@ -73,7 +73,7 @@ impl<'tcx> LateLintPass<'tcx> for UselessFormat {
                 if format_args.format_string.parts == [kw::Empty];
                 if arg.format.is_default();
                 if match cx.typeck_results().expr_ty(value).peel_refs().kind() {
-                    ty::Adt(adt, _) => cx.tcx.is_diagnostic_item(sym::String, adt.did()),
+                    ty::Adt(adt, _) => Some(adt.did()) == cx.tcx.lang_items().string(),
                     ty::Str => true,
                     _ => false,
                 };

clippy_lints/src/format_push_string.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use clippy_utils::{match_def_path, paths, peel_hir_expr_refs};
-use rustc_hir::{BinOpKind, Expr, ExprKind};
+use rustc_hir::{BinOpKind, Expr, ExprKind, LangItem};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
@@ -41,7 +41,7 @@ declare_clippy_lint! {
 declare_lint_pass!(FormatPushString => [FORMAT_PUSH_STRING]);
 
 fn is_string(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
-    is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), sym::String)
+    is_type_lang_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), LangItem::String)
 }
 fn is_format(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
     if let Some(macro_def_id) = e.span.ctxt().outer_expn_data().macro_def_id {

clippy_lints/src/from_str_radix_10.rs

@@ -1,10 +1,10 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::is_integer_literal;
 use clippy_utils::sugg::Sugg;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
-use rustc_hir::{def, Expr, ExprKind, PrimTy, QPath, TyKind};
+use rustc_hir::{def, Expr, ExprKind, LangItem, PrimTy, QPath, TyKind};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty::Ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
@@ -98,5 +98,5 @@ impl<'tcx> LateLintPass<'tcx> for FromStrRadix10 {
 
 /// Checks if a Ty is `String` or `&str`
 fn is_ty_stringish(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
-    is_type_diagnostic_item(cx, ty, sym::String) || is_type_diagnostic_item(cx, ty, sym::str)
+    is_type_lang_item(cx, ty, LangItem::String) || is_type_diagnostic_item(cx, ty, sym::str)
 }

clippy_lints/src/inherent_to_string.rs

@@ -1,8 +1,8 @@
 use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
+use clippy_utils::ty::{implements_trait, is_type_lang_item};
 use clippy_utils::{return_ty, trait_ref_of_method};
 use if_chain::if_chain;
-use rustc_hir::{GenericParamKind, ImplItem, ImplItemKind};
+use rustc_hir::{GenericParamKind, ImplItem, ImplItemKind, LangItem};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::sym;
@@ -105,7 +105,7 @@ impl<'tcx> LateLintPass<'tcx> for InherentToString {
             if impl_item.generics.params.iter().all(|p| matches!(p.kind, GenericParamKind::Lifetime { .. }));
 
             // Check if return type is String
-            if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id()), sym::String);
+            if is_type_lang_item(cx, return_ty(cx, impl_item.hir_id()), LangItem::String);
 
             // Filters instances of to_string which are required by a trait
             if trait_ref_of_method(cx, impl_item.owner_id.def_id).is_none();

clippy_lints/src/manual_retain.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use clippy_utils::{get_parent_expr, match_def_path, paths, SpanlessEq};
 use clippy_utils::{meets_msrv, msrvs};
 use rustc_errors::Applicability;
@@ -140,7 +140,7 @@ fn check_to_owned(
         && let Some(chars_expr_def_id) = cx.typeck_results().type_dependent_def_id(chars_expr.hir_id)
         && match_def_path(cx, chars_expr_def_id, &paths::STR_CHARS)
         && let ty = cx.typeck_results().expr_ty(str_expr).peel_refs()
-        && is_type_diagnostic_item(cx, ty, sym::String)
+        && is_type_lang_item(cx, ty, hir::LangItem::String)
         && SpanlessEq::new(cx).eq_expr(left_expr, str_expr) {
         suggest(cx, parent_expr, left_expr, filter_expr);
     }

clippy_lints/src/manual_string_new.rs

@@ -44,7 +44,7 @@ impl LateLintPass<'_> for ManualStringNew {
         let ty = cx.typeck_results().expr_ty(expr);
         match ty.kind() {
             ty::Adt(adt_def, _) if adt_def.is_struct() => {
-                if !cx.tcx.is_diagnostic_item(sym::String, adt_def.did()) {
+                if cx.tcx.lang_items().string() != Some(adt_def.did()) {
                     return;
                 }
             },

clippy_lints/src/matches/match_str_case_mismatch.rs

@@ -1,13 +1,13 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::{walk_expr, Visitor};
-use rustc_hir::{Arm, Expr, ExprKind, PatKind};
+use rustc_hir::{Arm, Expr, ExprKind, LangItem, PatKind};
 use rustc_lint::LateContext;
 use rustc_middle::ty;
 use rustc_span::symbol::Symbol;
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 
 use super::MATCH_STR_CASE_MISMATCH;
 
@@ -59,7 +59,7 @@ impl<'a, 'tcx> MatchExprVisitor<'a, 'tcx> {
         if let Some(case_method) = get_case_method(segment_ident) {
             let ty = self.cx.typeck_results().expr_ty(receiver).peel_refs();
 
-            if is_type_diagnostic_item(self.cx, ty, sym::String) || ty.kind() == &ty::Str {
+            if is_type_lang_item(self.cx, ty, LangItem::String) || ty.kind() == &ty::Str {
                 self.case_method = Some(case_method);
                 return true;
             }

clippy_lints/src/methods/bytes_count_to_len.rs

@@ -1,11 +1,10 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
-use rustc_span::sym;
 
 use super::BYTES_COUNT_TO_LEN;
 
@@ -20,7 +19,7 @@ pub(super) fn check<'tcx>(
         if let Some(impl_id) = cx.tcx.impl_of_method(bytes_id);
         if cx.tcx.type_of(impl_id).is_str();
         let ty = cx.typeck_results().expr_ty(bytes_recv).peel_refs();
-        if ty.is_str() || is_type_diagnostic_item(cx, ty, sym::String);
+        if ty.is_str() || is_type_lang_item(cx, ty, hir::LangItem::String);
         then {
             let mut applicability = Applicability::MachineApplicable;
             span_lint_and_sugg(

clippy_lints/src/methods/bytes_nth.rs

@@ -1,10 +1,9 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use rustc_errors::Applicability;
-use rustc_hir::Expr;
+use rustc_hir::{Expr, LangItem};
 use rustc_lint::LateContext;
-use rustc_span::sym;
 
 use super::BYTES_NTH;
 
@@ -12,7 +11,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>, recv: &'tcx E
     let ty = cx.typeck_results().expr_ty(recv).peel_refs();
     let caller_type = if ty.is_str() {
         "str"
-    } else if is_type_diagnostic_item(cx, ty, sym::String) {
+    } else if is_type_lang_item(cx, ty, LangItem::String) {
         "String"
     } else {
         return;

clippy_lints/src/methods/case_sensitive_file_extension_comparisons.rs

@@ -1,10 +1,10 @@
 use clippy_utils::diagnostics::span_lint_and_help;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use if_chain::if_chain;
 use rustc_ast::ast::LitKind;
-use rustc_hir::{Expr, ExprKind};
+use rustc_hir::{Expr, ExprKind, LangItem};
 use rustc_lint::LateContext;
-use rustc_span::{source_map::Spanned, symbol::sym, Span};
+use rustc_span::{source_map::Spanned, Span};
 
 use super::CASE_SENSITIVE_FILE_EXTENSION_COMPARISONS;
 
@@ -26,7 +26,7 @@ pub(super) fn check<'tcx>(
         if ext_str.chars().skip(1).all(|c| c.is_uppercase() || c.is_ascii_digit())
             || ext_str.chars().skip(1).all(|c| c.is_lowercase() || c.is_ascii_digit());
         let recv_ty = cx.typeck_results().expr_ty(recv).peel_refs();
-        if recv_ty.is_str() || is_type_diagnostic_item(cx, recv_ty, sym::String);
+        if recv_ty.is_str() || is_type_lang_item(cx, recv_ty, LangItem::String);
         then {
             span_lint_and_help(
                 cx,

clippy_lints/src/methods/expect_fun_call.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::macros::{root_macro_call_first_node, FormatArgsExpn};
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::{is_type_diagnostic_item, is_type_lang_item};
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
@@ -33,7 +33,7 @@ pub(super) fn check<'tcx>(
                     if (method_name.ident.name == sym::as_str || method_name.ident.name == sym::as_ref) && {
                         let arg_type = cx.typeck_results().expr_ty(receiver);
                         let base_type = arg_type.peel_refs();
-                        *base_type.kind() == ty::Str || is_type_diagnostic_item(cx, base_type, sym::String)
+                        *base_type.kind() == ty::Str || is_type_lang_item(cx, base_type, hir::LangItem::String)
                     } {
                         receiver
                     } else {
@@ -50,7 +50,7 @@ pub(super) fn check<'tcx>(
     // converted to string.
     fn requires_to_string(cx: &LateContext<'_>, arg: &hir::Expr<'_>) -> bool {
         let arg_ty = cx.typeck_results().expr_ty(arg);
-        if is_type_diagnostic_item(cx, arg_ty, sym::String) {
+        if is_type_lang_item(cx, arg_ty, hir::LangItem::String) {
             return false;
         }
         if let ty::Ref(_, ty, ..) = arg_ty.kind() {

clippy_lints/src/methods/inefficient_to_string.rs

@@ -1,13 +1,13 @@
 use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::ty::{is_type_diagnostic_item, walk_ptrs_ty_depth};
+use clippy_utils::ty::{is_type_lang_item, walk_ptrs_ty_depth};
 use clippy_utils::{match_def_path, paths};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
 use rustc_middle::ty::{self, Ty};
-use rustc_span::symbol::{sym, Symbol};
+use rustc_span::symbol::{Symbol, sym};
 
 use super::INEFFICIENT_TO_STRING;
 
@@ -60,7 +60,7 @@ fn specializes_tostring(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
         return true;
     }
 
-    if is_type_diagnostic_item(cx, ty, sym::String) {
+    if is_type_lang_item(cx, ty, hir::LangItem::String) {
         return true;
     }
 

clippy_lints/src/methods/manual_str_repeat.rs

@@ -36,14 +36,14 @@ fn parse_repeat_arg(cx: &LateContext<'_>, e: &Expr<'_>) -> Option<RepeatKind> {
         }
     } else {
         let ty = cx.typeck_results().expr_ty(e);
-        if is_type_diagnostic_item(cx, ty, sym::String)
+        if is_type_lang_item(cx, ty, LangItem::String)
             || (is_type_lang_item(cx, ty, LangItem::OwnedBox) && get_ty_param(ty).map_or(false, Ty::is_str))
             || (is_type_diagnostic_item(cx, ty, sym::Cow) && get_ty_param(ty).map_or(false, Ty::is_str))
         {
             Some(RepeatKind::String)
         } else {
             let ty = ty.peel_refs();
-            (ty.is_str() || is_type_diagnostic_item(cx, ty, sym::String)).then_some(RepeatKind::String)
+            (ty.is_str() || is_type_lang_item(cx, ty, LangItem::String)).then_some(RepeatKind::String)
         }
     }
 }
@@ -58,7 +58,7 @@ pub(super) fn check(
     if_chain! {
         if let ExprKind::Call(repeat_fn, [repeat_arg]) = take_self_arg.kind;
         if is_path_diagnostic_item(cx, repeat_fn, sym::iter_repeat);
-        if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(collect_expr), sym::String);
+        if is_type_lang_item(cx, cx.typeck_results().expr_ty(collect_expr), LangItem::String);
         if let Some(collect_id) = cx.typeck_results().type_dependent_def_id(collect_expr.hir_id);
         if let Some(take_id) = cx.typeck_results().type_dependent_def_id(take_expr.hir_id);
         if let Some(iter_trait_id) = cx.tcx.get_diagnostic_item(sym::Iterator);

clippy_lints/src/methods/no_effect_replace.rs

@@ -1,11 +1,10 @@
 use clippy_utils::diagnostics::span_lint;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use clippy_utils::SpanlessEq;
 use if_chain::if_chain;
 use rustc_ast::LitKind;
-use rustc_hir::ExprKind;
+use rustc_hir::{ExprKind, LangItem};
 use rustc_lint::LateContext;
-use rustc_span::sym;
 
 use super::NO_EFFECT_REPLACE;
 
@@ -16,7 +15,7 @@ pub(super) fn check<'tcx>(
     arg2: &'tcx rustc_hir::Expr<'_>,
 ) {
     let ty = cx.typeck_results().expr_ty(expr).peel_refs();
-    if !(ty.is_str() || is_type_diagnostic_item(cx, ty, sym::String)) {
+    if !(ty.is_str() || is_type_lang_item(cx, ty, LangItem::String)) {
         return;
     }
 

clippy_lints/src/methods/repeat_once.rs

@@ -1,11 +1,10 @@
 use clippy_utils::consts::{constant_context, Constant};
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::source::snippet;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use rustc_errors::Applicability;
-use rustc_hir::Expr;
+use rustc_hir::{Expr, LangItem};
 use rustc_lint::LateContext;
-use rustc_span::sym;
 
 use super::REPEAT_ONCE;
 
@@ -37,7 +36,7 @@ pub(super) fn check<'tcx>(
                 format!("{}.to_vec()", snippet(cx, recv.span, r#""...""#)),
                 Applicability::MachineApplicable,
             );
-        } else if is_type_diagnostic_item(cx, ty, sym::String) {
+        } else if is_type_lang_item(cx, ty, LangItem::String) {
             span_lint_and_sugg(
                 cx,
                 REPEAT_ONCE,

clippy_lints/src/methods/search_is_some.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{span_lint_and_help, span_lint_and_sugg};
 use clippy_utils::source::{snippet, snippet_with_applicability};
 use clippy_utils::sugg::deref_closure_args;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use clippy_utils::{is_trait_method, strip_pat_refs};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
@@ -105,7 +105,7 @@ pub(super) fn check<'tcx>(
     else if search_method == "find" {
         let is_string_or_str_slice = |e| {
             let self_ty = cx.typeck_results().expr_ty(e).peel_refs();
-            if is_type_diagnostic_item(cx, self_ty, sym::String) {
+            if is_type_lang_item(cx, self_ty, hir::LangItem::String) {
                 true
             } else {
                 *self_ty.kind() == ty::Str

clippy_lints/src/methods/string_extend_chars.rs

@@ -1,18 +1,17 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::method_chain_args;
 use clippy_utils::source::snippet_with_applicability;
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use rustc_errors::Applicability;
 use rustc_hir as hir;
 use rustc_lint::LateContext;
 use rustc_middle::ty;
-use rustc_span::symbol::sym;
 
 use super::STRING_EXTEND_CHARS;
 
 pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr<'_>, arg: &hir::Expr<'_>) {
     let obj_ty = cx.typeck_results().expr_ty(recv).peel_refs();
-    if !is_type_diagnostic_item(cx, obj_ty, sym::String) {
+    if !is_type_lang_item(cx, obj_ty, hir::LangItem::String) {
         return;
     }
     if let Some(arglists) = method_chain_args(arg, &["chars"]) {
@@ -20,7 +19,7 @@ pub(super) fn check(cx: &LateContext<'_>, expr: &hir::Expr<'_>, recv: &hir::Expr
         let self_ty = cx.typeck_results().expr_ty(target).peel_refs();
         let ref_str = if *self_ty.kind() == ty::Str {
             ""
-        } else if is_type_diagnostic_item(cx, self_ty, sym::String) {
+        } else if is_type_lang_item(cx, self_ty, hir::LangItem::String) {
             "&"
         } else {
             return;

clippy_lints/src/methods/unnecessary_join.rs

@@ -1,10 +1,10 @@
-use clippy_utils::{diagnostics::span_lint_and_sugg, ty::is_type_diagnostic_item};
+use clippy_utils::{diagnostics::span_lint_and_sugg, ty::is_type_lang_item};
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
-use rustc_hir::{Expr, ExprKind};
+use rustc_hir::{Expr, ExprKind, LangItem};
 use rustc_lint::LateContext;
 use rustc_middle::ty::{Ref, Slice};
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 
 use super::UNNECESSARY_JOIN;
 
@@ -21,7 +21,7 @@ pub(super) fn check<'tcx>(
         // the turbofish for collect is ::<Vec<String>>
         if let Ref(_, ref_type, _) = collect_output_adjusted_type.kind();
         if let Slice(slice) = ref_type.kind();
-        if is_type_diagnostic_item(cx, *slice, sym::String);
+        if is_type_lang_item(cx, *slice, LangItem::String);
         // the argument for join is ""
         if let ExprKind::Lit(spanned) = &join_arg.kind;
         if let LitKind::Str(symbol, _) = spanned.node;

clippy_lints/src/needless_pass_by_value.rs

@@ -1,7 +1,7 @@
 use clippy_utils::diagnostics::{multispan_sugg, span_lint_and_then};
 use clippy_utils::ptr::get_spans;
 use clippy_utils::source::{snippet, snippet_opt};
-use clippy_utils::ty::{implements_trait, is_copy, is_type_diagnostic_item};
+use clippy_utils::ty::{implements_trait, is_copy, is_type_diagnostic_item, is_type_lang_item};
 use clippy_utils::{get_trait_def_id, is_self, paths};
 use if_chain::if_chain;
 use rustc_ast::ast::Attribute;
@@ -11,7 +11,7 @@ use rustc_hir::intravisit::FnKind;
 use rustc_hir::{
     BindingAnnotation, Body, FnDecl, GenericArg, HirId, Impl, ItemKind, Mutability, Node, PatKind, QPath, TyKind,
 };
-use rustc_hir::{HirIdMap, HirIdSet};
+use rustc_hir::{HirIdMap, HirIdSet, LangItem};
 use rustc_hir_typeck::expr_use_visitor as euv;
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_lint::{LateContext, LateLintPass};
@@ -249,7 +249,7 @@ impl<'tcx> LateLintPass<'tcx> for NeedlessPassByValue {
                             }
                         }
 
-                        if is_type_diagnostic_item(cx, ty, sym::String) {
+                        if is_type_lang_item(cx, ty, LangItem::String) {
                             if let Some(clone_spans) =
                                 get_spans(cx, Some(body.id()), idx, &[("clone", ".to_string()"), ("as_str", "")]) {
                                 diag.span_suggestion(

clippy_lints/src/ptr.rs

@@ -450,7 +450,7 @@ fn check_fn_args<'cx, 'tcx: 'cx>(
                                 substs.type_at(0),
                             ),
                         ),
-                        Some(sym::String) => (
+                        _ if Some(adt.did()) == cx.tcx.lang_items().string() => (
                             [("clone", ".to_owned()"), ("as_str", "")].as_slice(),
                             DerefTy::Str,
                         ),

clippy_lints/src/redundant_clone.rs

@@ -1,12 +1,12 @@
 use clippy_utils::diagnostics::{span_lint_hir, span_lint_hir_and_then};
 use clippy_utils::mir::{visit_local_usage, LocalUsage, PossibleBorrowerMap};
 use clippy_utils::source::snippet_opt;
-use clippy_utils::ty::{has_drop, is_copy, is_type_diagnostic_item, walk_ptrs_ty_depth};
+use clippy_utils::ty::{has_drop, is_copy, is_type_diagnostic_item, is_type_lang_item, walk_ptrs_ty_depth};
 use clippy_utils::{fn_has_unsatisfiable_preds, match_def_path, paths};
 use if_chain::if_chain;
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
-use rustc_hir::{def_id, Body, FnDecl, HirId};
+use rustc_hir::{def_id, Body, FnDecl, HirId, LangItem};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::mir;
 use rustc_middle::ty::{self, Ty};
@@ -102,7 +102,7 @@ impl<'tcx> LateLintPass<'tcx> for RedundantClone {
             let from_borrow = match_def_path(cx, fn_def_id, &paths::CLONE_TRAIT_METHOD)
                 || match_def_path(cx, fn_def_id, &paths::TO_OWNED_METHOD)
                 || (match_def_path(cx, fn_def_id, &paths::TO_STRING_METHOD)
-                    && is_type_diagnostic_item(cx, arg_ty, sym::String));
+                    && is_type_lang_item(cx, arg_ty, LangItem::String));
 
             let from_deref = !from_borrow
                 && (match_def_path(cx, fn_def_id, &paths::PATH_TO_PATH_BUF)

clippy_lints/src/strings.rs

@@ -1,6 +1,6 @@
 use clippy_utils::diagnostics::{span_lint, span_lint_and_help, span_lint_and_sugg};
 use clippy_utils::source::{snippet, snippet_with_applicability};
-use clippy_utils::ty::is_type_diagnostic_item;
+use clippy_utils::ty::is_type_lang_item;
 use clippy_utils::{get_parent_expr, is_lint_allowed, match_function_call, method_calls, paths};
 use clippy_utils::{peel_blocks, SpanlessEq};
 use if_chain::if_chain;
@@ -190,7 +190,7 @@ impl<'tcx> LateLintPass<'tcx> for StringAdd {
             },
             ExprKind::Index(target, _idx) => {
                 let e_ty = cx.typeck_results().expr_ty(target).peel_refs();
-                if matches!(e_ty.kind(), ty::Str) || is_type_diagnostic_item(cx, e_ty, sym::String) {
+                if matches!(e_ty.kind(), ty::Str) || is_type_lang_item(cx, e_ty, LangItem::String) {
                     span_lint(
                         cx,
                         STRING_SLICE,
@@ -205,7 +205,7 @@ impl<'tcx> LateLintPass<'tcx> for StringAdd {
 }
 
 fn is_string(cx: &LateContext<'_>, e: &Expr<'_>) -> bool {
-    is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), sym::String)
+    is_type_lang_item(cx, cx.typeck_results().expr_ty(e).peel_refs(), LangItem::String)
 }
 
 fn is_add(cx: &LateContext<'_>, src: &Expr<'_>, target: &Expr<'_>) -> bool {
@@ -446,7 +446,7 @@ impl<'tcx> LateLintPass<'tcx> for StringToString {
             if let ExprKind::MethodCall(path, self_arg, ..) = &expr.kind;
             if path.ident.name == sym::to_string;
             let ty = cx.typeck_results().expr_ty(self_arg);
-            if is_type_diagnostic_item(cx, ty, sym::String);
+            if is_type_lang_item(cx, ty, LangItem::String);
             then {
                 span_lint_and_help(
                     cx,

clippy_lints/src/types/box_collection.rs

@@ -37,18 +37,19 @@ pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_
 fn get_std_collection(cx: &LateContext<'_>, qpath: &QPath<'_>) -> Option<Symbol> {
     let param = qpath_generic_tys(qpath).next()?;
     let id = path_def_id(cx, param)?;
-    cx.tcx.get_diagnostic_name(id).filter(|&name| {
-        matches!(
-            name,
-            sym::HashMap
-                | sym::String
-                | sym::Vec
-                | sym::HashSet
-                | sym::VecDeque
-                | sym::LinkedList
-                | sym::BTreeMap
-                | sym::BTreeSet
-                | sym::BinaryHeap
-        )
-    })
+    cx.tcx
+        .get_diagnostic_name(id)
+        .filter(|&name| matches!(name, sym::HashMap | sym::Vec | sym::HashSet
+            | sym::VecDeque
+            | sym::LinkedList
+            | sym::BTreeMap
+            | sym::BTreeSet
+            | sym::BinaryHeap))
+        .or_else(|| {
+            cx.tcx
+                .lang_items()
+                .string()
+                .filter(|did| id == *did)
+                .map(|_| sym::String)
+        })
 }

clippy_lints/src/types/rc_buffer.rs

@@ -91,10 +91,10 @@ pub(super) fn check(cx: &LateContext<'_>, hir_ty: &hir::Ty<'_>, qpath: &QPath<'_
 fn match_buffer_type(cx: &LateContext<'_>, qpath: &QPath<'_>) -> Option<&'static str> {
     let ty = qpath_generic_tys(qpath).next()?;
     let id = path_def_id(cx, ty)?;
-    let path = match cx.tcx.get_diagnostic_name(id)? {
-        sym::String => "str",
-        sym::OsString => "std::ffi::OsStr",
-        sym::PathBuf => "std::path::Path",
+    let path = match cx.tcx.get_diagnostic_name(id) {
+        Some(sym::OsString) => "std::ffi::OsStr",
+        Some(sym::PathBuf) => "std::path::Path",
+        _ if Some(id) == cx.tcx.lang_items().string() => "str",
         _ => return None,
     };
     Some(path)

clippy_lints/src/unnecessary_owned_empty_strings.rs

@@ -1,13 +1,12 @@
-use clippy_utils::{diagnostics::span_lint_and_sugg, ty::is_type_diagnostic_item};
+use clippy_utils::{diagnostics::span_lint_and_sugg, ty::is_type_lang_item};
 use clippy_utils::{match_def_path, paths};
 use if_chain::if_chain;
 use rustc_ast::ast::LitKind;
 use rustc_errors::Applicability;
-use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability};
+use rustc_hir::{BorrowKind, Expr, ExprKind, LangItem, Mutability};
 use rustc_lint::{LateContext, LateLintPass};
 use rustc_middle::ty;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
-use rustc_span::sym;
 
 declare_clippy_lint! {
     /// ### What it does
@@ -61,7 +60,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryOwnedEmptyStrings {
                         if let LitKind::Str(symbol, _) = spanned.node;
                         if symbol.is_empty();
                         let inner_expr_type = cx.typeck_results().expr_ty(inner_expr);
-                        if is_type_diagnostic_item(cx, inner_expr_type, sym::String);
+                        if is_type_lang_item(cx, inner_expr_type, LangItem::String);
                         then {
                             span_lint_and_sugg(
                                 cx,

clippy_utils/src/lib.rs

@@ -434,6 +434,16 @@ pub fn is_expr_path_def_path(cx: &LateContext<'_>, expr: &Expr<'_>, segments: &[
     path_def_id(cx, expr).map_or(false, |id| match_def_path(cx, id, segments))
 }
 
+/// If `maybe_path` is a path node which resolves to an item, resolves it to a `DefId` and checks if
+/// it matches the given lang item.
+pub fn is_path_lang_item<'tcx>(
+    cx: &LateContext<'_>,
+    maybe_path: &impl MaybePath<'tcx>,
+    lang_item: LangItem,
+) -> bool {
+    path_def_id(cx, maybe_path).map_or(false, |id| cx.tcx.lang_items().get(lang_item) == Some(id))
+}
+
 /// If `maybe_path` is a path node which resolves to an item, resolves it to a `DefId` and checks if
 /// it matches the given diagnostic item.
 pub fn is_path_diagnostic_item<'tcx>(
@@ -760,7 +770,6 @@ pub fn can_mut_borrow_both(cx: &LateContext<'_>, e1: &Expr<'_>, e2: &Expr<'_>) -
 /// constructor from the std library
 fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<'_>) -> bool {
     let std_types_symbols = &[
-        sym::String,
         sym::Vec,
         sym::VecDeque,
         sym::LinkedList,
@@ -777,7 +786,7 @@ fn is_default_equivalent_ctor(cx: &LateContext<'_>, def_id: DefId, path: &QPath<
                 if let Some(adt) = cx.tcx.type_of(impl_did).ty_adt_def() {
                     return std_types_symbols
                         .iter()
-                        .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did()));
+                        .any(|&symbol| cx.tcx.is_diagnostic_item(symbol, adt.did()) || Some(adt.did()) == cx.tcx.lang_items().string());
                 }
             }
         }
@@ -834,7 +843,7 @@ fn is_default_equivalent_from(cx: &LateContext<'_>, from_func: &Expr<'_>, arg: &
             ExprKind::Lit(hir::Lit {
                 node: LitKind::Str(ref sym, _),
                 ..
-            }) => return sym.is_empty() && is_path_diagnostic_item(cx, ty, sym::String),
+            }) => return sym.is_empty() && is_path_lang_item(cx, ty, LangItem::String),
             ExprKind::Array([]) => return is_path_diagnostic_item(cx, ty, sym::Vec),
             ExprKind::Repeat(_, ArrayLen::Body(len)) => {
                 if let ExprKind::Lit(ref const_lit) = cx.tcx.hir().body(len.body).value.kind &&